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Modified Constitutive Equation of Superplasticity Including Grain Growth Rate

Published online by Cambridge University Press:  10 February 2011

H. Miyazaki ,
T. Iseki  and
T. Yano
H. Miyazaki
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan, [email protected]
T. Iseki
Affiliation:
Department of Inorganic Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8552, Japan, [email protected]
T. Yano
Affiliation:
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
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Abstract

Superplastic behavior associated with grain growth in ceramics at high temperature is predicted by using a modified constitutive equation for superplasticity that incorporates the rate of grain growth. The equation reveals that there is an optimum deformation conditions – i.e., the strain rate and deformation temperature - so that ceramics have low flow stress when the grain growth is significant. The equation provides an explanation of increased flow stress for liquid-phase-sintered SiC in the slow-strain-rate region or higher-temperature region in which grain growth plays an important role.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 601: Symposium HH – Superplasticity-Current Status & Future Potential , 1999 , 175
Copyright
Copyright © Materials Research Society 2000

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